import re
str = """aldb153 2019-03-26 14:30:00
    2019-03-12 09:30:10"""
pattern = re.compile(r'\d{1,4}-\d{1,2}-\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2}')
match = pattern.findall(str)
print(match)
